HAVANA, May 10, 2002 (AP Online via COMTEX) -- Activists delivered more than 11,200 signatures to Cuba's National Assembly on Friday, demanding a referendum for broad changes in Cuba's socialist system less than 48 hours before a visit by former President Carter. Known as Project Varela, the signature-gathering campaign is seen as the biggest homegrown, nonviolent campaign to force reforms in the government established by Fidel Castro 43 years ago. The petitions propose a referendum that would ask voters if they favor civil liberties like free speech, an amnesty for political prisoners, the right to start their own businesses....